Дана матрица А(n,n) переставить местами максимальные и минимальные элементы- QBasic(Бейсик)

INPUT "vvedite razmer matricy N ", n
DIM a(n, n)
RANDOMIZE TIMER
PRINT "ishodnaya matrica"
FOR i = 1 TO n
    FOR j = 1 TO n
        a(i, j) = INT(RND * 100)
        PRINT a(i, j);
    NEXT
    PRINT
NEXT
imin = 1
jmin = 1
imax = 1
jmax = 1
FOR i = 1 TO n
    FOR j = 1 TO n
        IF a(i, j) < a(imin, jmin) THEN imin = i: jmin = j
        IF a(i, j) > a(imax, jmax) THEN imax = i: jmax = j
    NEXT
NEXT
PRINT "min=a("; imin; ", "; jmin; ")"
PRINT "max=a("; imax; ", "; jmax; ")"
SWAP a(imin, jmin), a(imax, jmax)
PRINT "novya matrica"
FOR i = 1 TO n
    FOR j = 1 TO n
        PRINT a(i, j);
    NEXT
    PRINT
NEXT